c# – 释放未插拔的虚拟串行端口

this._barcodeScanner = new SerialPort(comPort,9600,Parity.None,8,StopBits.One) { Handshake = Handshake.None,ReadTimeout = 500,WriteTimeout = 500 };
        this._barcodeScanner.Open();
        this._barcodeScanner.DataReceived += BarcodeScannerCallback;

如果USB设备在通过“SerialPort”类打开时拔下电源插头,则无法正常关闭软件,虚拟端口将永久保持打开状态,直到重启整个计算机.

所以我的问题是,在我通过C#代码拔下设备后,是否有办法关闭虚拟端口？

问候

[编辑1]

好吧,一些更多的代码：

这样,如果设备插入,我每10秒钟检查一次：

private bool CheckUsbDeviceAvailability()
    {
        ManagementObjectSearcher searcher = new ManagementObjectSearcher("rootWMI","SELECT * FROM MSSerial_PortName WHERE PortName = '" + this.PortName + "'");

        if (searcher.Get().Count > 0)
            return true;
        return false;
    }

这是串口的回调事件：

void BarcodeScannerCallback(object sender,SerialDataReceivedEventArgs e)
    {
        Thread.Sleep(500);
        string data = this._barcodeScanner.ReadExisting().Replace(Convert.ToChar(2),Convert.ToChar(32)).Trim();
        if (data.StartsWith("AX"))
        {
            string[] arrData = data.Split('n');
            this._barcodeScanner.StopAvailabilityThread();
            Barcode code = new Barcode(arrData[0].Replace("r",""));

            if (CheckIfBarcodeExists(code))
                this.UpdateBarcodeNode(code);
            else
                this.CreateBarcodeNode(code);

            BarcodeScannerCallbackEvent(sender,e,code);
            this._barcodeScanner.StartAvailabilityThread();
        }

        this._barcodeScanner.ComDevicePluggedIn = ScannerDevice.ComAvailabilityState.Available;
    }

如果它没有回答,将触发“DeviceNotAvailableEvent()”：

void BarcodeScannerDeviceNotAvailableEvent()
    {
        this._barcodeScanner.Close();
        this._barcodeScanner.Dispose();
    }

我已经覆盖了“SerialPort”类的Dispose事件,以便它将中止线程：

protected override void Dispose(bool isDisposing)
    {
        if (isDisposing)
        {
            this._deviceAvailableThread.Abort();

        }

        base.Dispose(isDisposing);
    }